And in the future don't rely on indicators, don't rely on drivers checking mirrors. Watch the angle the car is pointing, look at the front wheels to see if they are turning, and ride down the centre of the road.
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also watch for them leaving space between them and the car in front, look for eye contact and adjust your speed/position so you are not in the blind spot on the junction approach
also watch for them leaving space between them and the car in front, look for eye contact and adjust your speed/position so you are not in the blind spot on the junction approach